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from mod_pywebsocket import msgutil

# Hello in Japanese
_UNICODE_HELLO = u'\u3053\u3093\u306b\u3061\u306f'

# Goodbye in Japanese
_UNICODE_GOODBYE = u'\u3055\u3088\u3046\u306a\u3089'

# Error message
_ERROR_MESSAGE = 'What did you say?'


def web_socket_do_extra_handshake(request):
    pass  # Always accept.


def web_socket_transfer_data(request):
    hello = msgutil.receive_message(request)
    if hello != _UNICODE_HELLO:
        msgutil.send_message(request, _ERROR_MESSAGE)
        return
    msgutil.send_message(request, _UNICODE_GOODBYE)
